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In Mainz, he met Elector Johann Philip von Schonborn, who appointed him to his court as a judge in the High Court of Appeal and as an assistant to the Court Assessor Hermann Andreas Lasser. Before Mainz, Leibniz served as a secretary, assistant, librarian and adviser for Johann Christian von Boineburg, who was a minister to Schonborn. In 1672, Leibniz was sent to promote the plan of the French court .
(A Short ). He tried to convince the French to attack Egypt and tried to convince Louis XIV not to attack German areas (Gottfried Wilhelm von ). He was to look after Boineburg's son's education and upbringing in Paris. .
While in Paris, he became acquainted with many big names of mathematics and science. The theologian Antoine Arnauld, the theologian and philosopher Nicholas Malebranche, the mathematician Christian Huygens and the physicist Edme Mariotte were some of these people. After trying to obtain a nomination to the French Academy, he accepted an offer which got him a position in the court of the Duke Johann Friedrich of Hanover. Leibniz stayed in Paris for another three years concentrating his work in the area of mathematics with the aid of Christian Huygens. With Huygens" encouragement, Leibniz read Saint-Vincent's work on summing series and made some discoveries of his own in this area. Both Schonborn and Boineburg died within a short period of time of each other. Leibniz needed to find a new patron somewhere (A Short ). Meanwhile, .
Leibniz received much support from Boineburgs" family. In January of 1673 Leibniz and Boineburg's nephew went to England on a peace mission, after having failed in France. Leibniz visited the Royal Society, and demonstrated his incomplete calculating machine (Gottfried Wilhelm von ). This machine could add, subtract, multiply, divide and do square roots (Gottfried Wilhelm Leibniz). This machine was an improvement to Pascal's machine since Pascal's could only perform basic addition and subtraction.
